refactor!: replace Zustand global store with TanStack Query for systemFeatures

Follow-up to SSR prefetch migration (2833965). Eliminates the Zustand
middleman that was syncing TanStack Query data into a separate store.

- Remove useGlobalPublicStore Zustand store entirely
- Create hooks/use-global-public.ts with useSystemFeatures,
  useSystemFeaturesQuery, useIsSystemFeaturesPending, useSetupStatusQuery
- Migrate all 93 consumers to import from @/hooks/use-global-public
- Simplify global-public-context.tsx to a thin provider component
- Update 18 test files to mock the new hook interface
- Fix SetupStatusResponse.setup_at type from Date to string (JSON)
- Fix setup-status.spec.ts mock target to match consoleClient

BREAKING CHANGE: useGlobalPublicStore is removed. Use useSystemFeatures()
from @/hooks/use-global-public instead.

web/hooks/use-document-title.ts

@@ -1,12 +1,12 @@
 'use client'
 import { useFavicon, useTitle } from 'ahooks'
 import { useEffect } from 'react'
-import { useGlobalPublicStore, useIsSystemFeaturesPending } from '@/context/global-public-context'
+import { useIsSystemFeaturesPending, useSystemFeatures } from '@/hooks/use-global-public'
 import { basePath } from '@/utils/var'
 
 export default function useDocumentTitle(title: string) {
   const isPending = useIsSystemFeaturesPending()
-  const systemFeatures = useGlobalPublicStore(s => s.systemFeatures)
+  const systemFeatures = useSystemFeatures()
   const prefix = title ? `${title} - ` : ''
   let titleStr = ''
   let favicon = ''